What is the seeking of pleasure in The Sun Also Rises by Ernest Hemingway?
The previous post gave some good, general answers to your question. The characters of the novel do live a hedonistic lifestyle of extravagance and debauchery. They drink to excess--to drunkeness and beyond. They eat rich Parisian foods in restaurants both small and large. Sex (or the absence of sex, as in Jake's case) complements the other vices. Lady Brett Ashley has intimate relationships with nearly all of the main characters; homosexuality, prostitution and impotence are evident. The Parisian nightlife and music scene is another lure. Despite the dark attractions of Paris, the characters love to travel to other exotic destinations. Many of the characters do not hold regular jobs, and having fun--be it drinking, fishing or watching the bullfights--seems to be the primary goal of their lost lives.
The center characters in The sun also rises search pleasure through activities such as sex, drinking, traveling, fishing and we could generally say hedonism.They're running from responsibility and are avoiding to think about tomorrow because they belong to a so called lost generation and are disappointed in the values of the society.
The lost generation is term used to indicate notable American authors such as Hemingway that lived in Europe after the first World War as well as the general feeling of disillusionment of that period.